High-voltage surface-mounted PPTC resettable fuse

Abstract

The utility model relates to the technical field of fuses, and discloses a high-voltage surface-mounted PPTC resettable fuse which comprises a fuse body, the outer wall of the fuse body is fixedly connected with a first protective sleeve, the outer wall of the fuse body is fixedly connected with a second protective sleeve, the outer wall of the fuse body is provided with a heat dissipation assembly, and the heat dissipation assembly is fixedly connected with the protective sleeve. The heat dissipation assembly is used for dissipating heat of the fuse body; the heat dissipation assembly comprises a heat dissipation plate, one side of the heat dissipation plate is fixedly connected to the outer wall of the fuse body, the other side of the heat dissipation plate is fixedly connected with a plurality of heat dissipation fins, and the heat dissipation fins are evenly distributed on the other side of the heat dissipation plate in a linear array mode. According to the utility model, when the fuse body generates heat, the heat is conducted to the heat dissipation plate and then is transmitted to the heat dissipation fins, and the heat dissipation fins accelerate heat dissipation to the surrounding environment by increasing the contact area with air, so that the effect of effective heat dissipation of the fuse body is realized, and the stability of the fuse is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the fuse technical field especially relates to a high pressure patch type PPTC self recovery fuse. BACKGROUND

[0002] In the circuit protection of modern electronic equipment, self recovery fuse plays a vital role, with the continuous development of electronic technology, the power density of electronic equipment is increasing, the current and voltage in the circuit are increasing, which puts forward higher requirements for circuit protection elements, self recovery fuse is mainly applied to high voltage circuit scene, aims at providing reliable circuit protection function, this fuse can effectively radiate heat when overcurrent generates heat through unique heat dissipation design, ensures to keep stable low resistance state in normal working current range, guarantees the continuous normal conduction of circuit, thereby improves the stability and reliability of electronic equipment, prolongs the service life of equipment;

[0003] The traditional self recovery fuse usually uses PPTC material as the core element, and its basic working principle is to realize circuit protection by using the positive temperature coefficient characteristic of PPTC material, under normal working current, PPTC material presents low resistance state, and current can pass smoothly, when overcurrent appears in the circuit, the temperature of PPTC material rises rapidly, which leads to the sharp increase of its resistance, thereby limiting the current passing, and playing the role of protecting the circuit;

[0004] But the traditional self recovery fuse is easy to overheat due to poor heat dissipation under high current working environment, because of lacking special heat dissipation structure, when the current in the circuit is large, the heat generated by PPTC material cannot be dissipated in time, which leads to the rapid rise of its temperature, and the fuse will trigger the protection mechanism in advance before reaching the preset overcurrent threshold, and cut off the circuit, this false triggering phenomenon will affect the normal operation of electronic equipment, and reduce the working efficiency of equipment, therefore, the high pressure patch type PPTC self recovery fuse is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides a high pressure patch type PPTC self recovery fuse, which aims at improving the problem that heat cannot be dissipated in time, which leads to the rapid rise of its temperature, and the fuse will trigger the protection mechanism in advance before reaching the preset overcurrent threshold.

[0006] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0007] A high-voltage patch type PPTC self-restoring fuse, comprising a fuse body, a protective sleeve one is fixedly connected to the outer wall of the fuse body, a protective sleeve two is fixedly connected to the outer wall of the fuse body, a heat dissipation assembly is arranged on the outer wall of the fuse body, and the heat dissipation assembly is used for heat dissipation of the fuse body;

[0008] The heat dissipation assembly comprises a heat dissipation plate, one side of the heat dissipation plate is fixedly connected to the outer wall of the fuse body, and a plurality of heat dissipation fins are fixedly connected to the other side of the heat dissipation plate;

[0009] As a further description of the above technical scheme:

[0010] The protective sleeve one is internally fixedly connected with a pin one, and one end of the pin one is electrically connected to the inside of the fuse body;

[0011] As a further description of the above technical scheme:

[0012] The protective sleeve two is internally fixedly connected with a pin two, and one end of the pin two is electrically connected to the inside of the fuse body;

[0013] As a further description of the above technical scheme:

[0014] The pin one is slidably connected with a sleeve ring two on the outer wall, and the pin two is slidably connected with a sleeve ring one on the outer wall;

[0015] As a further description of the above technical scheme:

[0016] The sleeve ring one is fixedly connected with a connecting rod on the outer wall, and one end of the connecting rod is fixedly connected to the outer wall of the sleeve ring two;

[0017] As a further description of the above technical scheme:

[0018] The sleeve ring one and the sleeve ring two are connected through the connecting rod;

[0019] As a further description of the above technical scheme:

[0020] The sleeve ring one and the sleeve ring two are made of polycarbonate material, and have good dimensional stability.

[0021] The utility model has the advantages of:

[0022] 1. The utility model discloses a fuse body produces heat, and the heat is conducted to the heat dissipation plate, and then is given to the heat dissipation fin, and the heat dissipation fin accelerates the heat dissipation to the surrounding environment through increasing the contact area with air, realizes the effective heat dissipation effect of fuse body, solves the problem that heat cannot be dissipated in time, leads to the temperature rapid rise, can make fuse triggers protection mechanism in advance when reaching the preset overcurrent threshold, thereby improve the stability of fuse.

[0023] 2. The utility model discloses a sleeve ring one and sleeve ring two respectively on the pin one and pin two slide, and through connecting rod ensures that the relative position of both is stable, realizes the effect that the installation position of fuse is conveniently adjusted and protects the pin, solves the problem that the pin is easy to be bent and damaged and the position is difficult to accurately adjust in the installation process, thereby improve the installation convenience of fuse. DRAWINGS

[0024] Figure 1 A high-voltage patch type PPTC self-recovery fuse is provided.

[0025] Figure 2 A high-voltage patch type PPTC self-recovery fuse is provided.

[0026] Figure 3 A high-voltage patch type PPTC self-recovery fuse is provided.

[0027] LEGEND

[0028] 1, fuse body;2, protective sleeve one;3, protective sleeve two;4, pin one;5, pin two;6, heat dissipation plate;7, heat dissipation fin;8, sleeve ring one;9, sleeve ring two;10, connecting rod. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0030] REFERENCE Figure 1 and Figure 2The utility model provides an embodiment: a kind of high voltage patch PPTC self-restoring fuse, including fuse body 1, the outer wall of fuse body 1 is fixedly connected with protective sleeve one 2, the outer wall of fuse body 1 is fixedly connected with protective sleeve two 3, protective sleeve one 2 and protective sleeve two 3 can protect the connecting place of pin and fuse, and the outer wall of fuse body 1 is provided with heat dissipation component, and heat dissipation component is used to heat dissipation to fuse body 1;

[0031] The heat dissipation component includes a heat sink 6, which is fixedly connected to the outer wall of the fuse body 1 on one side. A plurality of heat dissipation fins 7 are fixedly connected to the other side of the heat sink 6. The plurality of heat dissipation fins 7 are evenly distributed in a linear array on the other side of the heat sink 6, allowing heat to be more efficiently conducted away through air convection, thereby maintaining the temperature stability of the fuse body 1 and ensuring its normal operation.

[0032] Specifically, when the fuse body 1 generates heat due to the passage of current during the use of the self-restoring fuse, the heat is first transferred to the surrounding heat dissipation structure through the conductive material of the fuse body 1, gradually dispersing to the nearby heat sink 6. The heat sink 6 has a large surface area to improve the efficiency of heat dispersion. The heat sink 6 is connected to the heat dissipation fins 7, which have a fin-like structure. The large surface area of the heat dissipation fins 7 increases the contact area with the air. When heat is transferred to the heat dissipation fins 7, the height and arrangement of the fins further enhance the contact with the surrounding air, promoting the dissipation of heat. Through the natural convection effect of air flow, heat is rapidly transferred from the heat dissipation fins 7 to the surrounding environment, reducing the temperature of the fuse body 1. This effectively reduces the temperature of the fuse, preventing it from triggering the protection mechanism prematurely due to overheating, and ensuring that the fuse maintains a stable low resistance state during operation.

[0033] Referring to Figure 1 and Figure 3 , the inner part of protective sleeve one 2 is fixedly connected with pin one 4, and the one end of pin one 4 is electrically connected to the inner part of fuse body 1. The inner part of protective sleeve two 3 is fixedly connected with pin two 5, which is used to introduce current into fuse body 1. The one end of pin two 5 is electrically connected to the inner part of fuse body 1. The outer wall of pin one 4 is slidingly connected with sleeve ring two 9, and the outer wall of pin two 5 is slidingly connected with sleeve ring one 8. The function of these two sleeve rings is to fix the movement position of the pins. The outer wall of sleeve ring one 8 is fixedly connected with connecting rod 10, and the one end of connecting rod 10 is fixedly connected to the outer wall of sleeve ring two 9. Sleeve ring one 8 and sleeve ring two 9 are connected through connecting rod 10. The function of connecting rod 10 is to fix sleeve ring one 8 and sleeve ring two 9 together, ensuring that they do not change position or loosen during operation. Sleeve ring one 8 and sleeve ring two 9 are made of polycarbonate material, which has good dimensional stability.

[0034] Specifically, in the installation process of the self-recovery fuse, the design of the sleeve ring one 8 and the sleeve ring two 9 plays an important role, the two sleeve rings can slide on the pin of the fuse, so that the installation process is more flexible and convenient, they can accurately adjust the position during installation, ensure the fit and contact performance of the fuse with the circuit board, the connecting rod 10 ensures the relative position stability between the sleeve ring one 8 and the sleeve ring two 9, so that the two sleeve rings will not be disordered during the installation process, not only improves the convenience of the installation process, but also protects the pin to a certain extent, in the installation or use process, if the pin is subjected to excessive bending or external force impact, it is easy to cause damage, affect the normal work of the fuse, and through the protection of the connecting rod 10 and the sleeve ring, the risk of damage to the pin can be effectively reduced, and the service life of the fuse is prolonged.

[0035] Working principle: when the self-recovery fuse is used, when the fuse body 1 generates heat due to the passage of current, the heat is conducted to the heat sink 6, and then transmitted to the heat dissipation fins 7 by the heat sink 6, the heat dissipation fins 7 increase the contact area with the air and accelerate the dissipation of heat to the surrounding environment, this heat dissipation mechanism can effectively reduce the temperature of the fuse body 1, prevent it from triggering the protection mechanism in advance due to overheating, ensure that the fuse remains in a stable low resistance state within the normal working current range, protect the normal conduction of the circuit, and during the installation process of the fuse, the sleeve ring one 8 and the sleeve ring two 9 can slide on the pin, which is convenient for adjusting the position, and the connecting rod 10 ensures the relative position stability of the two sleeve rings, which is convenient for SMT installation on the circuit board, and to a certain extent, the pin is protected from unnecessary bending or damage during installation or use.

[0036] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A high voltage chip PPTC self-restoring fuse comprising a fuse body (1), characterized in that: The fuse body (1) is fixedly connected with a protective sleeve one (2), the fuse body (1) is fixedly connected with a protective sleeve two (3), the fuse body (1) is provided with a heat dissipation assembly, the heat dissipation assembly is used for heat dissipation to the fuse body (1); The heat dissipation assembly includes a heat dissipation plate (6), one side of the heat dissipation plate (6) is fixedly connected with the fuse body (1), the other side of the heat dissipation plate (6) is fixedly connected with a plurality of heat dissipation fins (7), a plurality of heat dissipation fins (7) are evenly distributed in a linear array on the other side of the heat dissipation plate (6).

2. A high voltage patch PPTC self-restoring fuse according to claim 1, characterized in that: The protective sleeve one (2) is fixedly connected with a pin one (4) inside, one end of the pin one (4) is electrically connected in the fuse body (1) inside.

3. A high voltage, patch PPTC self-resetting fuse according to claim 2, characterized in that: The protective sleeve two (3) is fixedly connected with a pin two (5) inside, one end of the pin two (5) is electrically connected in the fuse body (1) inside.

4. A high voltage, patch PPTC self-resetting fuse according to claim 3, characterized in that: The pin one (4) is slidably connected with a sleeve ring two (9) outside, the pin two (5) is slidably connected with a sleeve ring one (8) outside.

5. A high voltage, patch PPTC self-resetting fuse according to claim 4, characterized in that: The sleeve ring one (8) is fixedly connected with a connecting rod (10) outside, one end of the connecting rod (10) is fixedly connected with the sleeve ring two (9) outside.

6. A high voltage, patch PPTC self-resetting fuse according to claim 5, characterized in that: The sleeve ring one (8) and the sleeve ring two (9) are connected through the connecting rod (10).

7. A high voltage, patch PPTC self-resetting fuse according to claim 6, characterized in that: The sleeve ring one (8) and the sleeve ring two (9) are made of polycarbonate material, and have good dimensional stability.

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